2005 International Conference on MEMS,NANO and Smart Systems最新文献_第8页

The use of microelectromechanical systems for surge detection in gas turbine engines 微机电系统在燃气轮机喘振检测中的应用

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.122

S. Andronenko, I. Stiharu, M. Packirisamy

{"title":"The use of microelectromechanical systems for surge detection in gas turbine engines","authors":"S. Andronenko, I. Stiharu, M. Packirisamy","doi":"10.1109/ICMENS.2005.122","DOIUrl":"https://doi.org/10.1109/ICMENS.2005.122","url":null,"abstract":"Compressor surge results from the instability of highly undesirable oscillations occurring at specific frequencies and at low compressor flow rates in the system. Research has shown that by stabilizing the small-perturbation dynamics, the large-amplitude surge event can be prevented in these systems. In order to completely avoid the initiations of conditions that will lead to surge or stall, engine designs conservatively determine operational stability margins that are far from the stability limit of the compression system. Advanced turbine engines operate with reduced stability margins to increase performance. This reduction in stability margin must be limited to such an extent that does not compromise the operational capability of the engine. Pressure probes equipped with fast-response transducers have been successfully used in axial-flow compressors and turbines but have been rarely used in centrifugal compressors. The harsh thermal environment of operation has limited the use of pressure transducers to operational ranges below 250/spl deg/C effectively precluding measurement at the final stage exit where temperatures are typically in excess 280/spl deg/C depending on the turbine. This paper proposes a hybrid processing method in which a piezoresistive chromium strain gauge is embedded between two thin film silicon carbide (SiC-MEMS) or silicon carbon nitride microelectromechanical (SiCN-MEMS) membranes as an enhanced technique for the design of high temperature pressure transducers. The hybrid process technology, which enables fabrication of such structure, along with the novel packaging principles represents the main contribution of the present report.","PeriodicalId":185824,"journal":{"name":"2005 International Conference on MEMS,NANO and Smart Systems","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124113660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Advanced microphotonic and MEMS technologies for the MEOS microsatellite Earth observation mission MEOS微卫星地球观测任务的先进微光子和MEMS技术

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.22

R. Kruzelecky, Jing Zou, B. Wong, E. Haddad, W. Jamroz, Wanping Zheng, L. Phong

{"title":"Advanced microphotonic and MEMS technologies for the MEOS microsatellite Earth observation mission","authors":"R. Kruzelecky, Jing Zou, B. Wong, E. Haddad, W. Jamroz, Wanping Zheng, L. Phong","doi":"10.1109/ICMENS.2005.22","DOIUrl":"https://doi.org/10.1109/ICMENS.2005.22","url":null,"abstract":"Infrared spectroscopy is a vital component of various Earth observation and planetary exploration space missions. It probes the characteristic vibrational modes of chemical bonds in molecules to provide information about not only the chemical composition but also the local bonding configuration and environment of the chemical bond. In particular, infrared spectroscopy has been employed to study atmospheric processes and various gas distributions. To date, mainly large bulk-optic Fourier transform (FT-IR) spectrometers employing variations of the Michelson interferometer, and massive high-order dispersive spectrometers have been employed in space for atmospheric studies on large and costly satellite platforms. In the following paper, we discuss the use of advanced optical coding and signal processing techniques to enable high-performance infrared spectral measurements of atmospheric components using MPB's miniature IR waveguide spectrometer. The miniature size of the spectrometer enables several dedicated spectrometers to be accommodated on a single microsatellite to extend the measurements that are feasible. In particular, these advanced technologies are being employed as the basis for the development of the use of the MEOS micro Earth observation mission.","PeriodicalId":185824,"journal":{"name":"2005 International Conference on MEMS,NANO and Smart Systems","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125902679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Novel one dimensional nanostructures 新型一维纳米结构

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.91

M. Meyyappan

引用次数: 2

Compositional dependence of wetting and contact angles in solid-liquid-liquid systems under realistic environments 现实环境下固-液-液体系润湿和接触角的组分依赖性

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.35

Wei Xu, S. Ayirala, D. Rao

{"title":"Compositional dependence of wetting and contact angles in solid-liquid-liquid systems under realistic environments","authors":"Wei Xu, S. Ayirala, D. Rao","doi":"10.1109/ICMENS.2005.35","DOIUrl":"https://doi.org/10.1109/ICMENS.2005.35","url":null,"abstract":"The wetting and contact angles in porous media are important for the characterization of multi-phase flow behavior. The polar components such as asphaltenes in the oil-phase, which have been widely believed to be a major source of oil-wetting characteristics. The effect of light gaseous ends in crude oil on wetting is studied by depleting the pressure at regular intervals. The variation of contact angles observed with the pressure during the pressure depletion clearly showed the influence of light ends on wetting. The water-advancing contact angle of live crude oil gradually increased from 55/spl deg/ at bubble point pressure to 154/spl deg/ at ambient pressure. The de-asphaltened and the deresined crude oils showed strong oil-wet characteristics as stocktank crude oil. The light gaseous ends in oil phase appear to peptize the asphaltene molecules by surrounding them, thereby preventing their agglomeration and migration to the interface. The differences observed in the behavior of dynamic interfacial tensions between live and stocktank crude oils further substantiates the influence of light gaseous ends on the activity of polar components in live oil. The influence of solid surface roughness, mineralogy of rock substrates as well as the brine composition on wetting and contact angles have also been investigated. For highly smooth substrates, carbonate and silica showed relatively similar high water-advancing contact angles, while for rough substrates, the advancing contact angles on silica were much lower compared to the carbonates.","PeriodicalId":185824,"journal":{"name":"2005 International Conference on MEMS,NANO and Smart Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116168238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Microtubule stability studied by integral equation theory 用积分方程理论研究微管稳定性

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.73

P. Drabik, A. Kovalenko

引用次数: 1

A new method of electrostatic force modeling for MEMS sensors and actuators MEMS传感器及致动器静电力建模新方法

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.16

S. Chowdhury, M. Ahmadi, W. Miller

引用次数: 4

Modeling of the behavior of random carbon nanotubes during field emission 随机碳纳米管在场发射过程中的行为建模

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.75

N. Sinha, J. Yeow

引用次数: 4

Integration of silicon circuit components onto plastic substrates using fluidic self-assembly 利用流体自组装将硅电路元件集成到塑料基板上

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.63

S.A. Stauth, B. Parviz

引用次数: 8

Non-linear elastic deformations of multi-phase fluid systems 多相流体系统的非线性弹性变形

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.86

J. Gaydos

引用次数: 26

Pulse-actuated micromechanical resonator using digital Kalman observer 采用数字卡尔曼观测器的脉冲驱动微机械谐振器

2005 International Conference on MEMS,NANO and Smart Systems Pub Date : 2005-07-24 DOI: 10.1109/ICMENS.2005.101

É. Colinet, D. Galayko, J. Juillard

引用次数: 0